Overview
The M41T80M6F, produced by STMicroelectronics, is a low-power serial real-time clock (RTC) with a built-in 32.768 kHz oscillator that is external crystal controlled. This device is designed to provide accurate time-keeping and alarm functions, making it suitable for a variety of applications. The M41T80 features eight registers for the clock/calendar function, configured in binary coded decimal (BCD) format, and an additional 12 registers for alarm, 32 KHz output, and square wave functions. Data is transferred serially via a two-line, bi-directional I2C interface.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Operating Voltage | Supply voltage range | 2.0 to 5.5 V |
| Operating Temperature | Ambient operating temperature range | –40 to 85 °C |
| Oscillator Frequency | Crystal oscillator frequency | 32.768 kHz |
| Interface | Serial interface type and speed | I2C bus (400 kHz) |
| Package | Package type | 8-pin SOIC |
| Operating Current | Low operating current | 200 µA |
| Alarm and Interrupt | Programmable alarm and interrupt function | Yes |
| Square Wave Output | Programmable square wave output frequency | 1 Hz to 32 KHz |
| RoHS Compliance | RoHS compliance grade | Ecopack3 |
Key Features
- Counters for tenths/hundredths of seconds, seconds, minutes, hours, day, date, month, year, and century in 24-hour BCD format.
- 32 KHz crystal oscillator integrating load capacitance (12.5 pF) for exceptional oscillator stability.
- Serial interface supports I2C bus (400 kHz).
- 32 KHz square wave output on power-up to drive a microcontroller in low-power mode.
- Programmable (1 Hz to 32 KHz) square wave output.
- Programmable alarm and interrupt function.
- Low operating current of 200 µA.
- Operating temperature range of –40 to 85 °C.
- ECOPACK® package available.
Applications
The M41T80 is suitable for various industrial and consumer applications where accurate time-keeping and alarm functions are required. Some typical applications include:
- Industrial control systems.
- Consumer electronics such as clocks, timers, and alarm systems.
- Automotive systems requiring precise timing.
- Medical devices and equipment.
- Embedded systems and microcontrollers in low-power modes.
Q & A
- What is the operating voltage range of the M41T80?
The M41T80 operates within a supply voltage range of 2.0 to 5.5 V.
- What type of interface does the M41T80 use?
The M41T80 uses a two-line, bi-directional I2C interface with a speed of up to 400 kHz.
- What is the package type of the M41T80?
The M41T80 is supplied in an 8-pin SOIC package.
- Does the M41T80 have a programmable alarm function?
Yes, the M41T80 has a programmable alarm and interrupt function.
- What is the frequency range of the programmable square wave output?
The square wave output can be programmed to frequencies ranging from 1 Hz to 32 KHz.
- How does the M41T80 handle leap years?
The M41T80 automatically corrects for 28, 29 (leap year - valid until year 2100), 30, and 31 day months.
- What is the operating current of the M41T80?
The M41T80 has a low operating current of 200 µA.
- Is the M41T80 RoHS compliant?
Yes, the M41T80 is RoHS compliant with an Ecopack3 grade.
- What is the operating temperature range of the M41T80?
The M41T80 operates within an ambient temperature range of –40 to 85 °C.
- How does the M41T80 ensure oscillator stability?
The M41T80 features a 32 KHz crystal oscillator with integrated load capacitance (12.5 pF) for exceptional oscillator stability.
